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超临界CO_(2)压裂井筒流动规律及影响因素研究

Study on the Flow Regularity and Influencing Factors of Wellbore Fracturing with Supercritical CO_(2)
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摘要 当前,超临界CO_(2)压裂过程中井筒内的温度、压力影响参数敏感性分析和影响程度定量化表征尚未有系统性研究。首先开展CO_(2)物性参数、压力场和温度场的相互耦合关系研究,构建了井筒内非稳态温度-压力耦合计算模型。然后运用计算模型对施工参数开展了敏感性分析和影响程度定量评价研究,结果表明:排量和绝对粗糙度与温度、压力呈现负相关性;注入温度、注入压力、管径与井筒内温度、压力呈现正相关性;地温梯度与井筒内温度呈现正相关性,但对井筒内压力基本上没有影响;井底温度的主要影响参数依次为排量、注入温度、管径,井底压力的主要影响参数依次为排量、注入压力、绝对粗糙度。研究成果对于CO_(2)压裂设计优化及现场施工具有重要指导意义。 At present,there are no systematic studies on the sensitivity analysis and quantitative characterization of the influence parameters of temperature and pressure in wellbore during the process of supercritical CO_(2)fracturing.Firstly,the coupling relationship between CO_(2)physical property parameters,pressure field and temperature field was studied,and the unsteady temperature and pressure coupling calculation model in wellbore was established.Then,the sensitivity analysis and quantitative evaluation of the influence degree of the construction parameters were carried out by using the calculation model.The results showed that the displacement and absolute roughness were negatively correlated with temperature and pressure.Injection temperature,injection pressure,pipe diameter were positively correlated with the temperature and pressure in the wellbore.The geothermal gradient was positively correlated with the temperature in the wellbore,but had no effect on the pressure in the wellbore.The main influencing parameters of bottom hole temperature were displacement,injection temperature and pipe diameter,while the main influencing parameters of bottom hole pressure were displacement,injection pressure and absolute roughness.The research results had important guiding significance for CO_(2)fracturing design optimization and site construction.
作者 花靖 蒋秀 于超 谷成林 解辉 Hua Jing;Jiang Xiu;Yu Chao;Gu Chenglin;Xie Hui(State Key Laboratory of Chemical Safety,Shandong,Qingdao,266104;SINOPEC Research Institute of Safety Engineering Co.,Ltd.,Shandong,Qingdao,266104)
出处 《安全、健康和环境》 2024年第10期11-19,共9页 Safety Health & Environment
基金 国家自然科学基金项目(52304017),构造应力集中区水力压裂诱发断层滑移及套管剪切变形动力学机理研究 中国石化科技部课题(321044),页岩油超临界CO_(2)压裂与生产中材料腐蚀冲蚀机制及控制技术研究。
关键词 超临界CO_(2) 压裂 流动规律 非稳态 敏感性分析 正交试验 supercritical CO_(2) fracturing flow law unsteady sensitivity analysis orthogonal test
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